It’s all about which candidate will make his life better. It is entirely self-interest. No different than a prostitute that lets a John hit her, because he’ll pay more for the option. Like has nothing to do with it.
(Aside, I’m not blaming the prostitute in the above example, there’s a lot of other factors for that profession, just using a nice insulting way to say that Barr’s virtue is entirely mercenary in the wealth and social sense)